The following table indicates the percentage of residential electricity consumption in the United States, in a recent year organized by type of use.

Type of Use                          Percentage
Cooking.................................................2%
Cooling................................................15%
Electronics............................................9%
Heating................................................15%
Lighting...............................................13%
Refrigeration......................................10%
Water heating.....................................10%
Wet cleaning.........................................3%
Other....................................................23%

a. Construct a bar chart, a pie chart, and a Pareto chart.

b. Which graphical method do you think is best for portraying these data?

c. What conclusions can you reach concerning residential electricity consumption in the United States?